In older adults a urinary tract infection can show up as sudden confusion (delirium) instead of burning or urgency. Delirium is a medical emergency, but a positive urine test alone does not prove the infection is the cause, so look for other causes too.
Key symptoms
- Sudden confusion that changes during the day
- Inattention, drowsiness or agitation
- Fever, burning on urination, urgency, new incontinence
- Flank or lower belly pain, poor intake, falls
What you find on exam
- Delirium screen with the CAM (Confusion Assessment Method)
- Vital signs; look for sepsis and dehydration
- Suprapubic and flank tenderness; bladder scan for retention
- Review medications such as anticholinergics, opioids and sedatives
Tests
- Urinalysis and urine culture from a properly collected sample
- Blood count, metabolic panel, glucose; blood cultures if septic
- Look for other causes: chest X-ray, ECG, medication review
Treatment basics
- Antibiotics guided by local resistance and culture, such as cephalexin or ceftriaxone
- Fluids; treat pain, constipation and urinary retention
- Non-drug delirium care: family, glasses and hearing aids, orientation, sleep, early mobility
- Avoid restraints and sedatives; low-dose antipsychotic only for dangerous agitation
- Do not treat bacteria in the urine without symptoms
Red flags
- Low blood pressure, fast heart rate or fever (urosepsis)
- Rapidly worsening level of consciousness
- Urinary retention or a blocked catheter
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Sources: NCSBN 2026 NCLEX-RN Test Plan; NCCPA PANCE Content Blueprint; NBOME COMLEX-USA clinical presentations. Written by Making Synapses. Making Synapses is not affiliated with these organizations.